WebGL 2: a small fix to support mipmap level in framebufferTexture2D

Source/core/html/canvas/WebGLRenderingContextBase.cpp

Index: Source/core/html/canvas/WebGLRenderingContextBase.cpp
diff --git a/Source/core/html/canvas/WebGLRenderingContextBase.cpp b/Source/core/html/canvas/WebGLRenderingContextBase.cpp
index 0de60d442fa09bf2852f82e317b2e02e28247600..4c7cc57438bcead5516d20fa34c7911ad4e7c9e6 100644
--- a/Source/core/html/canvas/WebGLRenderingContextBase.cpp
+++ b/Source/core/html/canvas/WebGLRenderingContextBase.cpp
@@ -2039,7 +2039,10 @@ void WebGLRenderingContextBase::framebufferTexture2D(GLenum target, GLenum attac
 {
     if (isContextLost() || !validateFramebufferFuncParameters("framebufferTexture2D", target, attachment))
         return;
-    if (level) {
+    if (isWebGL2OrHigher()) {
+        if (!validateTexFuncLevel("framebufferTexture2D", textarget, level))
+            return;
+    } else if (level) {
         synthesizeGLError(GL_INVALID_VALUE, "framebufferTexture2D", "level not 0");
         return;
     }